[en] The very neutron-deficient isotope ⁹⁴Ag was produced at the GSI on-line mass separator by using the reaction ⁵⁸Ni(⁴⁰Ca, p3n). The β-decay properties of ⁹⁴Ag were studied by detecting for the first time β-delayed γ rays and β-γ-γ coincidences. Both the population of excited levels in the daughter nucleus ⁹⁴Pd and the β-decay half-life of ⁹⁴Ag were investigated. The major part of the feeding was assigned to the decay of an I^π=(7⁺) isomer with a half-life of (0.36±0.03) s. A weak β-decay branch was found to populate high-spin levels in the ⁹⁴Pd daughter with I≥18. It is tentatively assigned to the decay of a high-spin parent state in ⁹⁴Ag with I≥17 and a half-life (0.3±0.2) s. The measured β-decay properties as well as the level structure of ⁹⁴Ag and ⁹⁴Pd are discussed in comparison with shell-model predictions

[en] The very neutron-deficient isotope ⁹⁴Ag was produced at the GSI on-line mass separator by using the reaction ⁵⁸Ni(⁴⁰Ca,p3n). The β-decay properties of ⁹⁴Ag were studied by detecting for the first time β-delayed γ rays and β-γ-γ coincidences. Both the population of excited levels in the daughter nucleus ⁹⁴Pd and the β-decay half-life of ⁹⁴Ag were investigated. The major part of the feeding was assigned to the decay of an I^π=(7⁺) isomer with a half-life of (0.36±0.03) s. A weak β-decay branch was found to populate high-spin levels in the ⁹⁴Pd daughter with I≥18. It is tentatively assigned to the decay of a high-spin parent state in ⁹⁴Ag with I≥17 and a half-life (0.3±0.2) s. The measured β-decay properties as well as the level structure of ⁹⁴Ag and ⁹⁴Pd are discussed in comparison with shell-model predictions. (orig.)

[en] The ⁷²Ge(n,α)^69mZn, ⁷⁴Ge(n,α)^71mZn, ⁷⁶Ge(n,2n)^75g+mGe and ¹⁹¹Ir(n,2n)¹⁹⁰Ir_g+m1 and ¹⁹¹Ir(n,2n)¹⁹⁰Ir_m2 reaction cross sections were measured from 9.6 to 11.4 MeV relative to the ²⁷Al(n,α)²⁴Na reference reaction via the activation method. The quasi-monoenergetic neutron beams were produced via the ²H(d,n)³He reaction at the 5 MV VdG Tandem T11/25 accelerator of NCSR 'Demokritos'. Statistical model calculations using the codes STAPRE-F and EMPIRE (version 2.19) and taking into account pre-equilibrium emission were performed on the data measured in this work as well as on data reported in literature. (authors)

[en] The ⁷²Ge(n,α)^69mZn, ⁷⁴Ge(n,α)^71mZn, ⁷⁶Ge(n,2n)^75g+mGe reaction cross sections have been measured from 9.6 to 11.4 MeV and studied, along with data from literature, within the frame of the statistical model using the code EMPIRE-II.

[en] In the present work, isoscaling studies have been carried out in ⁸⁶Kr + ^112,124Sn, ¹⁹⁷Au reactions at E_lab=30 MeV/nucleon

[en] A systematic investigation of (p,γ) cross sections of nuclei from Se to Sb is presented. In-beam cross section measurements were carried out at E_p = 1.4-5 MeV by using an array of 4 HPGe detectors of 100% relative efficiency shielded with BGO crystals. The S factors obtained are compared with the predictions of the statistical model code MOST

[en] The ¹⁹¹Ir(n,2n)¹⁹⁰Ir cross section was measured by means of the activation technique at four neutron energies in the range 10.0-11.3 MeV. The quasimonoenergetic neutron beam was produced via the ²H(d,n)³He reaction at the 5.5 MV Tandem Van de Graaff accelerator of NCSR 'Demokritos'. The cross section for the population of the second high spin (11^-) isomeric state was measured along with the sum of the reaction cross section populating both the ground (4^-) and the first isomeric state (1^-). Statistical model calculations taking into account pre-equilibrium emission were performed and compared with all the available experimental data. The experimentally deduced excitation function for populating both the ground and first isomeric state was well reproduced by the theoretical calculations. The statistical model calculations of populating the second metastable state revealed its strong dependence on the details of the introduced level scheme, as well as on the ratio between the effective moment of inertia and the rigid body moment of inertia of the residual nucleus. The experimental cross-section data corresponding to the second isomeric state and to the isomeric ratio were reproduced in a quite consistent way by the calculations

[en] The production and separation of neutron-rich rare isotope beams in peripheral collisions around the Fermi energy is described in the present work. The experiments were performed at the Cyclotron Institute of Texas A and M University employing beams from the K500 Superconducting Cyclotron. Two magnetic separators were used: the MARS recoil separator and the Superconducting Solenoid Line (BigSol Line). Enhanced production cross sections of neutron-rich nuclides in comparison with high-energy fragmentation mechanisms were observed and attributed to the role of the N/Z and the nuclear periphery of the target. From a practical viewpoint, these reactions below or around the Fermi energy offer a promising way to access very neutron-rich rare isotopes. The experience obtained in the production of rare isotope beams (RIB) in this energy range will be applied in the ongoing RIB upgrade of the Cyclotron Institute that will involve production, stopping and re-acceleration of rare isotopes.

[en] Assuming a schematic form of the nucleon effective mass as a function of nuclear excitation energy and mass, we provide a simple explanation for understanding the experimentally observed mass dependence of the nuclear caloric curve. It is observed that the excitation energy at which the caloric curve enters into a plateau region could be sensitive to the nuclear mass evolution of the effective nucleon mass

[en] As a continuation of a systematic study of reactions relevant to the astrophysical p process, the cross sections of the ^74,76Se(p,γ) ^75,77Br and ⁸²Se(p,n) ⁸²Br reactions have been measured at energies from 1.3 to 3.6 MeV using an activation technique. The results are compared to the predictions of Hauser-Feshbach statistical model calculations using the NON-SMOKER and MOST codes. The sensitivity of the calculations to variations in the optical proton potential and the nuclear level density was studied. Good agreement between theoretical and experimental reaction rates was found for the reactions ⁷⁴Se(p,γ) ⁷⁵Br and ⁸²Se(p,n) ⁸²Br